<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
   <!-- <script>
        window.onload=function(){
          var div = document.querySelector(".div");
          div.onclick = function(){
              alert(1);
          }
        }
        
    </script> -->
    <script src="./01 js.js"></script>
</head>
<body>
    <div class="div">点我</div>
    <a href="javascript:void(0)">空链接</a>
</body>
</html>